Refertothewxhibit.whatQOSmodelshouldbeusedtoreservetherequestedbandwidthanddelayneededforeachallowedVOIPcallregardlessofchangingnetworkconditions?() A.best-effortdeliveryB.ingresscommittedrate（ICR）C.shapingandpolicingD.egresscommittedrate（ECR）E.integratedServices（IntServ）F.differentiatedservices（DiffServ）
Refertothewxhibit.whatQOSmodelshouldbeusedtoreservetherequestedbandwidthanddelayneededforeachallowedVOIPcallregardlessofchangingnetworkconditions?()
A.best-effortdelivery
B.ingresscommittedrate（ICR）
C.shapingandpolicing
D.egresscommittedrate（ECR）
E.integratedServices（IntServ）
F.differentiatedservices（DiffServ）